I saw the WIP pictures of this on Flickr, and I have to say that it came out great! I love the angle of the wall, as well as all of the detail you crammed in. Looks like you have a very good shot at winning. Good Luck!
EDIT: One thing that I'd like to point out, though it doesn't take away from the MOC itself, is that any proper fortified city would have outward curving walls for strength, not weak inward curving walls.